Slaughter High

On April Fools Day 1976, high school outcast Marty Rantzen is seduced by popular girl Carol Manning in the women's locker room. This is revealed as a prank as several students appear and mock Marty's naked body. Led by troublemaker Skip Pollack, the students physically abuse Marty before the coach intervenes. Later, two of the students, Ted Harrison and Carl Putney, feign remorse and offer Marty marijuana laced with something to make him sick. Skip messes with Marty's science project, accidentally setting off a chain of events which end with Marty being doused with nitric acid. Marty is left disfigured. Carol meets Skip and the others at their high school reunion ten years later in 1986. They find they were the only ones invited, with the school long-vacant and in disrepair. They decide to break in and party, and unbeknownst to them, the school's caretaker Digby is killed by a man wearing a jester hat and an old man mask, the same ones Skip wore during the shower prank. Soon the friends begin dying in a variety of ways – Ted's stomach explodes upon drinking an acid-laced beer, Shirley is melted with acid while taking a bath, Carl is impaled while trying to escape in a car, Susan is killed off-screen, Joe is eviscerated by tractor blades, Stella and Frank are electrocuted while having sex, and Nancy is drowned in a cesspit. Skip is hanged by a noose but escapes. The jester chases Carol throughout the school, and in her panic, she accidentally kills Skip with an axe to the face. Finally, the jester kills Carol with a javelin in the locker room where the initial prank occurred. Removing his mask, the jester is revealed as Marty, who revels in his revenge before he hallucinates and gets attacked by the spirits of the people he just slaughtered and passes out. Marty wakes up in a hospital where he's recovering, with bandages on his face. A nurse walks in and comments that Marty's skin graft operation was successful. An alarm in his room is activated, and his doctor comes into the room to assist. Just as he does this, Marty switches places with the nurse, killing her. He turns around and then kills the doctor who has entered the room. Marty then rips off the new skin grafted to his face.